Guidelines recommend that all admitted patients with community-acquired pneumonia should have a collection of two sets of blood cultures, a good quality sputum sample for Gram stain and culture, a sample of pleural fuid if present and, for severe patients, an urine sample for antigen detection. In contrast, several prospective studies (usually without include urinary tests) concluded that these microbiological studies have limited value in the management of patients admitted with community-acquired pneumonia.